package com.nowcoder.community.controller;

import com.google.code.kaptcha.Producer;
import com.nowcoder.community.Utils.CommunityConstant;
import com.nowcoder.community.Utils.CommunityUtil;
import com.nowcoder.community.Utils.RedisKeyUtil;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author panxingyu
 */
@Controller
public class LoginController implements CommunityConstant {
    private static final Logger LOGGER = LoggerFactory.getLogger(LoginController.class);

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 跳转注册页面
     *
     * @return
     */
    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage() {
        return "/site/register";
    }

    /**
     * 跳转登陆页面
     *
     * @return
     */
    @RequestMapping(path = "/login", method = RequestMethod.GET)
    public String getLoginPage() {
        return "/site/login";
    }

    /**
     * 注册是否成功的页面数据
     */
    @RequestMapping(path = "/register", method = RequestMethod.POST)
    public String register(Model model, User user) {
        Map<String, Object> map = userService.register(user);
        if (map == null || map.isEmpty()) {
            // 注册成功，跳转到一个第三方页面
            model.addAttribute("msg", "注册成功，我们已向您的邮箱发送了一封激活邮件，请尽快激活!");
            model.addAttribute("target", "/index");
            return "/site/operate-result";
        } else {
            // 注册失败，回到注册页面，在页面中提示错误消息
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            return "/site/register";
        }
    }

    /**
     * 激活是否成功的页面数据
     */
    // http://localhost:8080/community/activation/101/code
    @RequestMapping(path = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code) {
        int result = userService.activation(userId, code);
        if (result == ACTIVATION_SUCCESS) {
            model.addAttribute("msg", "激活成功，您的账号已经可以正常使用了!");
            model.addAttribute("target", "/login");
        } else if (result == ACTIVATION_REPEAT) {
            model.addAttribute("msg", "无效操作，该账号已经激活");
            model.addAttribute("targer", "/index");
        } else {
            model.addAttribute("msg", "激活失败,您提供的激活码不正确!");
            model.addAttribute("target", "/index");
        }
        return "/site/operate-result";
    }

    /**
     * 生成验证码
     *
     * @param response
//     * @param session  将验证码保存到 session 中，方便登录时验证 验证码输入是否正确
     */
    @RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response /*, HttpSession session*/ ) {
        // 生成验证码
        String text = kaptchaProducer.createText();
        BufferedImage image = kaptchaProducer.createImage(text);

        /*
            将验证码字符串保存到 session，登录时需要从 session 中取出该验证码与页面数据中的验证码进行比较，来判断输入是否正确。
            session.setAttribute("kaptcha", text);
         */
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(60);
        cookie.setPath(contextPath);
        response.addCookie(cookie);
        // 将验证码存入 Redis
        String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        // 设置过期时间 60s
        redisTemplate.opsForValue().set(redisKey, text, 60, TimeUnit.SECONDS);


        // 将图片输出给浏览器
        try {
            response.setContentType("image/png");
            ServletOutputStream os = response.getOutputStream();
            ImageIO.write(image, "png", os);
        } catch (IOException e) {
            LOGGER.error("响应验证码失败" + e.getMessage());
        }
    }

    @RequestMapping(path = "/login", method = RequestMethod.POST)
    public String login(String username, String password, String code, boolean rememberMe,
                        Model model/*, HttpSession session*/, HttpServletResponse response,
                        @CookieValue("kaptchaOwner") String kaptchaOwner) {
        // 检查验证码
        // String kaptcha = (String) session.getAttribute("kaptcha");
        String kaptcha = null;
        if (StringUtils.isNotBlank(kaptchaOwner)) {
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey);
        }
        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
            model.addAttribute("codeMsg", "验证码不正确");
            return "/site/login";
        }
        // 检查账号、密码
        // 登录凭证的过期时间
        int expiredSeconds = rememberMe ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String, Object> map = userService.login(username, password, expiredSeconds);
        if (map.containsKey("ticket")) {
            // 登录成功，将登录凭证返回给客户端保存
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            return "redirect:/index";
        } else {
            // 登录失败，添加错误信息
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "/site/login";
        }
    }

    /**
     * 退出，从 Cookie 中获取登录凭证
     * @param ticket
     * @return
     */
    @RequestMapping(path = "logout", method = RequestMethod.GET)
    public String logout(@CookieValue("ticket") String ticket) {
        userService.logout(ticket);
        // 退出登录清理认证信息
        SecurityContextHolder.clearContext();
        return "redirect:/login";
    }
}
